Officers at Christie’s public sale home stated on Saturday that the marquee gross sales that account for almost half of its annual income would proceed, regardless of the corporate having misplaced management of its official web site final Thursday in a hack that’s testing the loyalty of its ultrawealthy purchasers amid its spring auctions.

On Sunday night, in his first public assertion because the cyberattack, Guillaume Cerruti, the chief government of Christie’s, confirmed that eight auctions would proceed as scheduled this week, with bidding in particular person and by cellphone (the uncommon watches sale has been postponed till Could 14). “We’re wanting ahead to welcoming you to our exhibitions and to registering you to take part in these auctions,” he wrote in an emailed assertion. Neither Cerruti nor a spokeswoman for the public sale home responded to questions of how the net portion of the public sale would proceed.

On Thursday, Christie’s skilled what it referred to as a “know-how safety difficulty” that took its firm web site offline, leaving in place an apology and the promise to supply “additional updates to our purchasers as applicable.” By Sunday, the positioning was nonetheless down.

It was the second time in lower than a yr that Christie’s had suffered a breach. In August, a German cybersecurity firm revealed a data breach on the public sale home that leaked the places of artworks held by a number of the world’s wealthiest collectors.

Over the weekend, dozens of these potential consumers gathered on the firm’s galleries at Rockefeller Heart in Manhattan to view the costly artworks which have a complete excessive estimate of almost $840 million, and to debate bidding. Staff led non-public excursions previous the enormous Andy Warhol “Flowers” silk-screen portray from 1964 that carries a excessive estimate of $30 million, and down towards the extra modestly priced day gross sales, the place a Barbara Kruger paintings proclaiming “You possibly can’t drag your cash into the grave with you” had a excessive estimate of $600,000.

Christie’s workers assured some purchasers within the galleries that its web site can be mounted “imminently,” however on Saturday afternoon, when the corporate nonetheless had not regained management, it changed a short lived touchdown web page on the positioning since Thursday with one other momentary web site produced by means of a free net design firm referred to as Shorthand. The momentary website lets viewers browse on-line catalogs of upcoming gross sales however doesn’t permit on-line bidding or registration.

Behind the scenes, two public sale home workers, who requested to not be recognized as a result of they weren’t licensed to talk publicly, described a state of panic during which high leaders remained quiet in regards to the particulars of the safety breach and haven’t addressed questions from workers about whether or not the hackers have accessed confidential details about purchasers and are holding it for ransom.

A number of distinguished consumers and sellers additionally stated that they had been left at the hours of darkness in regards to the incident, and that that they had not been alerted to the hack till a reporter referred to as.

“A cyberattack like that is the Twenty first-century equal of a hand grenade in a small room,” stated the artwork market lawyer Thomas C. Danziger, who usually represents purchasers at public sale. “Twenty-five years in the past, it could have been a flood or a hurricane.”

Wendy Cromwell, an artwork adviser, stated that critical consumers would discover methods of doing enterprise with the public sale home even because it skilled technical difficulties.

“It’s a nightmare, clearly, with all of the cost and purchaser knowledge they personal. I’ve not heard from Christie’s relating to my firm’s account,” she wrote in an e mail.

However by way of the upcoming auctions, she stated, “I’m planning to attend the night gross sales in particular person. I don’t often bid on-line.”

On Saturday afternoon, as collectors milled by means of the galleries, a receptionist stated Cerutti was not within the workplace. Cerutti took the reins of the corporate in 2016 at a time when public sale homes had been struggling to seek out robust estates and stock to attract new consumers.

The hack was dangerous timing — not only for Christie’s executives, however for the Pinault household, which controls the public sale home by means of Groupe Artémis, a holding firm. Artémis additionally controls Kering, the posh group that owns vogue manufacturers like Gucci and Balenciaga and is run by the billionaire François-Henri Pinault, who can be managing companion of Artemis (together with his father, François Pinault, the household patriarch).

In March, Kering issued a profit warning that forecast a ten % drop in group revenues within the first three months of 2024, with gross sales at Gucci, its largest model, falling almost 20 % year-on-year within the first quarter.

The Christie’s hack has additionally occurred within the midst of a management transition: The 26-year-old grandson of François Pinault, François Louis Nicolas Pinault, took the enterprise mogul’s seat on the public sale home board earlier this year. His household representatives didn’t instantly reply to a request for touch upon Saturday.

Sotheby’s and Phillips — the 2 different main public sale homes — stated that they had not skilled any cyberattacks in latest weeks.

Chelsea Binns, a cybercrime knowledgeable who teaches on the John Jay Faculty of Legal Justice in Manhattan, stated that the majority corporations are unprepared for hackers and must be making ready by doing drills and drafting a backup plan.

“Nevertheless it’s only a matter of time,” she stated. “There’s a little bit of denial about actuality.”

Extra reporting by Julia Halperin and Vanessa Friedman in New York.